Insulator for bridle wires



Jan. 29, 1929.

B. JOHNSON IRSULATOR FOR BRIDLE WIRES Filed march 25. 1922 IN VEN TOR.Jlvs am Q ATTORNEY ga leakage occurs is broken.

Patented J an. 29, G1929.

UNITED STATES l PATENT OFFICE.

IEKJAMIN JOHNSON, .OF ,EAST ONON'DA'GA, NEW YORK, ASSIYGNOR TOAMERICANTELE- IP HONE AND TELEGRAPH COMPANY, A CORPORATION OF NEW YORK. l

yI'JS'SULATOIR, FOR BRIDLE VVIBES.A

Application inea March 25', -1922. sei-iai Nof inermi.`

In the construction of open lines for the transmission of electricalsignals, itf is a common practice to connect the bare line conductors toapparat-us mounted upon the poles, as

arresters, means of depending conductors bridle wires, provided with theusual insulating cover'iiig,.including an inner layer of or to theterminals of cables by yi() some such material as rubber,- and an outerprotecting textile layer or braid impregnated with a substance whichrenders it more or 'less nonhygroscopic. Between the-'line and connectedpoints, these bridle ivires are cleated to the crossarms, and are liableto come in contact with one another and with the arms. When the wiresare new, there isno marked leakage, but after exposure the voutercovering becomes absorbent, and in '2Q damp weather this furnishes a`conducting path between bare portions ot bridle wires, and from themtri-ground. 0n some circuits,

as high efciency .loaded telephone lines, considerable transmissionlosses are thus introduced. To prevent this, it has been proposed toshelter against moisture a portion of the covering of each bridle wire,this including a continuous ring about its circumference, so that thepath 'through which the The provision of an inexpensive insulator forthis purpose, which will remain eective in use, has proven dicult and tothis the present invention is directed.

4ln the accompanying drawing, `in which certain embodiments of theimproved insulator are illustrated, Figure l isa vertical section ot oneform ot the insulator; Fig. 2 represents the device in use, and Fig. 3is an 4o elevation ot another term of the invention,

showing the bridle wire in place. A

Similar characters of reference designate like partel in the severalvviews ot the drawinf. Y

zlhe ii'isulatorl 5 comprises a tubular body portion preferably composedof glass, it having a head portion provided with a cir cuniterentialAflange 6, which is adapted to engagea downwardly extending edge of a 5ocap-7; ltithin the upper circular surface ot the cap 7 is provided adisk 8, of some such.

springy substance as cork or the like, which adheres snugly thereto. Thedisk 8 is of larger diameter than the opening of the tubular portion 5,and when the cap 'i is loading coils and their light-ningv termed ningarrester.

placed in positionthe disk covers the top of the; tubular portion, sothat by means of the resilient material comprising said disk, atight'and water-proof closure is provided between the'- cap and tubularportion when they are clampedtogether. A perforation 9 is provided iiithe center of the cap 7 and disk 8 through which the bared end of abridle wire passes. l

In the modification shown in Fig. 3, the tubular body portion 5 isprovided .with lared ends. A cap 7 is aiiXe'd to the upper flared end byany suitable means, and this securing means also serves to keep in placean interposed layer of moisture-prooic ma- =terial, such as parailinedpaper, which covers the bridle wire in vertical 'position so that itwillfnot Contact with the sides of the tubular Y portion 5 and thusprovide a path for the leakage ot current. rlhe .member l() alsoprovides means nfor closing the tube against moisture, thereby.improving its insulating Characteristics. ln Fig. 2, which illustratesthe device in quse, a portion of a pole llis shown, with its crossarm 12carrying the usuall line insulator 13. Upon this insulator the lineconductor la is dead-ended, and from the line the bridle wire l5 leadsthrough cleats i6 to apparatus not shown, but which, as previouslyindicated, may be a loading coil and its light- When the bridle wire isprepared for con-' nection with the line, enough of its end is baredtoextend through the opening provided in the top 'oii 'the insulator andleave a portion for wrapping about the line wire. Below this bared parta portion oit braid is removed leaving exposed the inner layer oliinsulating' material between the bare wire and the outer layer of braid,lThe insulated portion of the covering which lies within the chamber ofthe tubular portion together 'with the remainder of the braided portionare prei:- erably coated with asphaltum or a like plastic insulatingsubstance. Thus prepared, the end of the bidle wires is drawn throughtheopeniiig in the cap covering lll@ i' The free end of the bridle WireY to the line in the customary manner. rlhe A insulator and parted bythe wind. The `wire iol the opening and secure the wire to` said cap. isjoined insulator hangs upon the wire in a vertical 'position and thesolder completes a joint whichefectuallyiexcludes water. The joint isamply strong to resist the weight of the the play which -will beimpassing downwardly through the tubular chamber is held away from thesides and ends thereof by fthe spacing means'provided in the tubularportion Vso that the leakage of current between thesey elements isrestricted to that which can take place on and through the spacing meansThe path for leakage is further broken by the removal of the braidwithin the chamber portion which prevents moisture being carriedfurtherl along the .ab-

sorbent braid by capillary attraction. It

will be obvious that the above described insulator provides aninexpensive arrangement which will not rapidly deteriorate or beseriously affected by climatic conditions.

While there are shown and described herein certain preferred forms ofthe invention .by way of illustration, it will be understood that it isnot limited or confined to the pref reise details of construction hereindescribed,

as modifications and variations Amay be inade within the scope of theclainiwithout departing from the spirit of the invention. What isclaimed is: f An insulator adapted for use with bridle wires, saidbridle wires having a bared portion and an adjacent portion withinsulated c0v'ering, a tubular chamber for said insulator, acircumferential flange and a cap for engaging said flange and renderingsaid chamber water-proof, the bai-ed portion of the bridlerwireextending through said cap and being secured thereto, and the insulatedportion terminating in said chamber to prepositioned within the chamberportion and above the bottom o the insulatorl for retaining the bridlewire in vertical position and free fromv contact with the bottom of saidinsulator, said spacing means providing with the vertical wall of the`tubular chamber a sheltered recess to interrupt the exteriorconductivity of the insulator under wet weather conditions 'to restrictythe leakage of current between the elements of the insulator.

In testimony whereof, I have signed my name to this specification March,1922.

BEN J AMlN JOHNSON.

vthis 20th day of

